teach diffcore-rename to optionally ignore empty content

diff --git a/cache.h b/cache.h
index e12b15f4b92da906c50f7f51df95b126347e9441..52805748012f97bb8ef3aa67ecc3b0d611d4cd3c 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -708,6 +708,19 @@ static inline void hashclr(unsigned char *hash)
 #define EMPTY_TREE_SHA1_BIN \
         ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
 
+#define EMPTY_BLOB_SHA1_HEX \
+       "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
+#define EMPTY_BLOB_SHA1_BIN_LITERAL \
+       "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
+       "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
+#define EMPTY_BLOB_SHA1_BIN \
+       ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
+
+static inline int is_empty_blob_sha1(const unsigned char *sha1)
+{
+       return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
+}
+
 int git_mkstemp(char *path, size_t n, const char *template);
 
 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
@@ -950,7 +963,9 @@ struct cache_def {
 extern int has_symlink_leading_path(const char *name, int len);
 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 extern int check_leading_path(const char *name, int len);
+extern int threaded_check_leading_path(struct cache_def *cache, const char *name, int len);
 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
+extern int threaded_has_dirs_only_path(struct cache_def *cache, const char *name, int len, int prefix_len);
 extern void schedule_dir_for_removal(const char *name, int len);
 extern void remove_scheduled_dirs(void);